[asterisk-users] SIP, Polycom, Asterisk - VPN

[Joshua Colp]

Danny Nicholas wrote:
> IAX uses one port; SIP uses 2-4 per call. We use Polycom 550’s to talk
> to an Asterisk 10.X box. Nothing special on the Asterisk side; just have
> to get your VPN to talk to the Asterisk network.

To be slightly pedantic SIP UDP generally uses a single port (5060). RTP 
generally uses two ports (one for RTP and one for RTCP). If you have 
multiple media streams (one audio and one video) those are two RTP 
sessions, so a total of 4 ports. If you have only an audio stream then 
that is a total of 2 ports.

-- 
Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at:  www.digium.com  & www.asterisk.org